whining pa siren speaker

I just installed a wolo animal sounds unit in my truck and there are 3 sound selections to choose from: animal, siren, and pa system. When I choose pa system you can hear a whining noise from the siren and when I rev, you can hear it through the siren also. Any suggestions on how to stop the whining?

thanks

oO

I'm not familiar with the system you're talking about, but in general if you hear alternator whine in an audio system, you have a bad ground somewhere.

Good luck.

Thanks DYohn but by badground do you mean loose, or what? It so, should I sand down the ground stop?

thanks

Thanks for the change but it still didn't work. I sanded down the chassis where the ground bolt was, but still didn't work. Does it matter that I am sharing the power point with other accessories( one power cable from my + on battery connects to a spot in the engine bay with a bolt and from there I connected several things)? Would it matter that I am running the speaker siren wire side by side with the ground and power? Hmmmmm......I think those are the only things left to consider. Any more help...?...

thanks

oO